fix(automation): rebuild highlights after final bridge restore

[Sam-24-dev]

Summary

• version the local Sunday Reddit runner used by TechnologyTrend-RedditBaselineWeekly
• rebuild only home_highlights.json from the final restored bridge set before integrity validation
• replace broad cleanup with an exact-file snapshot/rollback for tracked and ignored run outputs

Root cause

sync_assets.py built Home highlights from stale datos/latest GitHub data. The runner then restored canonical non-Reddit bridges but did not rebuild Home highlights, so the integrity gate correctly rejected the mixed artifact set.

Safety

• publication steps remain after all integrity and date checks
• any prepublication failure restores prior bytes and removes only exact files created by that run
• no git clean command is used
• canonical bridges and timestamps are not altered to force a pass
• no ETL, scheduled task, workflow dispatch, or deploy was executed

Validation

• python -m pytest tests/test_local_reddit_runner.py -q — 3 passed
• python -m pytest tests -q — 233 passed, 1 existing Pandera warning
• python -m compileall -q backend tests
• ruff check tests/test_local_reddit_runner.py
• bandit -q -ll tests/test_local_reddit_runner.py
• PowerShell parser validation for both automation files
• detect-secrets-hook --baseline .secrets.baseline on the staged diff
• git diff --cached --check

Operational note

After merge, the separate automation clone must receive the merged runner before the next scheduled execution. This PR does not alter or run Task Scheduler.

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